This is a very small telephone exchange attached only two ordinary Tele phones. Fully bi-directional facility with an intercom system. When a phone is in off hook condition , Exchange will detect it & send ringing pulse to other phone. When it will be picked up , the connection will be established between both phones. This will be taken place vice-versa.
Micro Controller = PIC16F84A
Firmware version = 1.00
Power Supply = 230 v
Power Supply Unit
The Power Supply Unit.
This is used normal step down transformer (400ma) for generating three type of deference voltages & 100 AC volt for rigging.
It doesn’t provided a PCB pattern for the power supply unit. So a Vero board can be used to build the unit.
Parts List :
1.Step down transformer ( 230 V to 30 V , 15 V & 100 V )
2.Two bridged 1 A rectifiers
3.7805 – 5V regulator
4.7812 – 12V regulatorThis is used normal step down transformer (400ma) for generating three type of deference voltages & 100 AC volt for rigging.
It doesn’t provided a PCB pattern for the power supply unit. So a Vero board can be used to build the unit.
Parts List :
1.Step down transformer ( 230 V to 30 V , 15 V & 100 V )
2.Two bridged 1 A rectifiers
3.7805 – 5V regulator
5.1000 uf – 35 V
6.1000 uf – 16 v
7.150 ma fuse & it’s holders.
8.Necessary Wires & a wire code for AC supply.
Controlling Unit
The controlling unit ( Exchange )
This circuit is base on PIC16F84A microcontroller. Two slimier SLIC are connected to The controlling unit. It needs to identify following connections on the controlling unit circuit diagram.
TN_SLIC_1 & TN_SLIC_2
SD_SLIC_1 & SD_SLIC_2
RG_SLIC_1 & RG_SLIC_2
One SLIC connections should be marked as,
1. TN_SLIC_1
2. SD_SLIC_1
3. RG_SLIC_1
Other SLIC connections should be marked as,
1. TN_SLIC_2
2. SD_SLIC_2
3. RG_SLIC_2
These connections should be connected as on the controlling unit circuit diagram.
This circuit is base on PIC16F84A microcontroller. Two slimier SLIC are connected to The controlling unit. It needs to identify following connections on the controlling unit circuit diagram.
TN_SLIC_1 & TN_SLIC_2
SD_SLIC_1 & SD_SLIC_2
RG_SLIC_1 & RG_SLIC_2
One SLIC connections should be marked as,
1. TN_SLIC_1
2. SD_SLIC_1
3. RG_SLIC_1
Other SLIC connections should be marked as,
1. TN_SLIC_2
2. SD_SLIC_2
3. RG_SLIC_2
These connections should be connected as on the controlling unit circuit diagram.
Parts List :
Transistors
1. 2SC945 x 3
Diodes
1. 1N4007 x 1
2. 1N4148 x 2
3. LED x 1
Capacitors ( 16 V )
1. 4.7 uf x 4
2. 22 pf x 2
Resistors
1. 10 K x 4
2. 4.7 K x 4
3. 330 x 1
Other Parts
12 V telephone rely x 1
Necessary wires
PIC16F84A with the firmware
Controlling Unit |
The controlling unit ( Exchange )This circuit is base on PIC16F84A microcontroller. Two slimier SLIC are connected to The controlling unit. It needs to identify following connections on the controlling unit circuit diagram.TN_SLIC_1 & TN_SLIC_2SD_SLIC_1 & SD_SLIC_2RG_SLIC_1 & RG_SLIC_2One SLIC connections should be marked as,1. TN_SLIC_12. SD_SLIC_13. RG_SLIC_1Other SLIC connections should be marked as,1. TN_SLIC_22. SD_SLIC_23. RG_SLIC_2These connections should be connected as on the controlling unit circuit diagram.
Parts List :Transistors1. 2SC945 x 3Diodes1. 1N4007 x 12. 1N4148 x 23. LED x 1Capacitors ( 16 V )1. 4.7 uf x 42. 22 pf x 2Resistors1. 10 K x 42. 4.7 K x 43. 330 x 1Other Parts12 V telephone rely x 1Necessary wiresPIC16F84A with the firmware
SLIC  The SLIC (Subscriber Line Interface Circuit ) This unit is required to detect every status from an usual telephone set for the Controlling circuit ( Exchange ). It interfaces an usual telephone to the controlling circuit. Two slimier SLIC are required for this project.  Parts list : Transistors 1.2SD667 x 1 2.2SC945 x 2 Diodes 1. 1N4007 x 4 2. 9 v zener x 3 3. 12 v zener x 1 4. LED x 1 Capacitors ( 16 V ) 1. 47 uf x 1 2. 22 uf x 1 3. 220 uf x 1 Resistors 1. 10 K x 3 2. 47 K x 1 3. 470 x 1 4. 100 x 2 5. 47 ( ½ w ) x 1 6. 5 (½ w ) x 2 Other Parts RJ 11 telephone connector x 1 12 V telephone rely x 1 Necessary wires    Downloads |
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